sql查詢中的關節手術

-3

我在從數據庫中獲取數據時遇到問題。sql查詢中的關節手術

我有表名爲purchaseorder並從我使用有數量列必須減去由用戶輸入一定量，並通過JSP頁面顯示效果，幫助我解決問題

下面是代碼，

String pno = request.getParameter("PONo"); 
    String receivedQty =request.getParameter("ReceivedQty"); 
    int Rqty = Integer.parseInt(receivedQty); 
    /*String quantity = request.getParameter("Quantity"); 
    int Qty = Integer.parseInt(quantity);*/ 

    Connection conn = null; 
    try { 
     Class.forName("com.mysql.jdbc.Driver"); 
     conn = DriverManager.getConnection("jdbc:mysql://localhost:3306", "root", "dinga"); 
     PreparedStatement ps = conn.prepareStatement("Select PODate,PONo,Quantity AS OrderingQty ,(Quantity-?) AS BalanceQty From project.purchaseorder where PONo=?"); 
     ps.setInt(1,Rqty); 
     ps.setString(2,pno); 

     ResultSet rs = ps.executeQuery(); 
     //System.out.println("resultset Value"+rs); 
     if (rs.next()) { 
      request.setAttribute("result", rs); 
      rd = request.getRequestDispatcher("ProcessingActualGRN.jsp"); 
      rd.forward(request, response); 
     } 
    } catch (SQLException e) { 
    } catch (ClassNotFoundException e) { 
    } finally { 
     try { 
      if (conn != null) { 
       conn.close(); 
      } 
     } catch (SQLException ex) { 
     } 
    } 
    } 
    }

jsp頁面

<table id="table2"> 
    <tr> 
     <th>Iteam Discription</th> 
     <th>OrderingQty</th> 
     <th>PO Date</th> 
     <th>Reveived Quantity</th> 
     <th>Balance Quantity</th> 
     <th>Received Date</th> 
    </tr> 
    <% 
     do { 
    %> 
    <tr> 
     <td><%=request.getParameter("PONo") %></td> 
     <td><%=rs.getInt(25)%></td> 
     <td><%=request.getParameter("Quantity") %> 
     <!-- <td>null(1)</td> --> 
     <td><%=rs.getString(1) %></td> 
     <td><%=request.getParameter("ReceivedQty")%></td> 
     <td><%=request.getParameter("BalanceQty")%></td> 
     <td><%=request.getParameter("ReceivedDate")%></td> 
    </tr> 
     <% 
     } while (rs.next()); 
    %>`

在JSP中<%=rs.getInt(25)%>我收到錯誤等

org.apache.jasper.JasperException：發生異常處理JSP頁/ProcessingActualGRN.jsp在線路87

87：<％= rs.getInt（25）％>

來源

2016-05-05 Santosh Vastrad

@Honza Brabec，@ Pillar，@ Radiodef，@ Lukas Eder –

@ ketan，TQ和什麼是解決方案是他們在代碼 –

代碼中的任何錯誤，把代碼放在try catch塊中並捕獲異常。然後我們可以很輕鬆地幫你 – androidGenX

<% 
     do { 
    %> 
    <tr> 
     <td><%=request.getParameter("PONo") %></td> 
     <td><%=rs.getString(1) %></td> 
     <td><%=rs.getInt(3)%></td> 
     <td><%=request.getParameter("ReceivedQty")%></td> 
     <td><%=rs.getInt(4) %></td> 
     <td><%=request.getParameter("ReceivedDate")%></td> 
    </tr> 
    <% 
     } while (rs.next()); 
    %>

我輸出我做了錯誤的同時也讓指數值... TQ

來源

2016-05-05 07:01:43

sql查詢中的關節手術

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